Prepare the potatoes: Peel, wash, and slice the potatoes into ¼ inch batons, then place in a large bowl of cold/room temp water.
Prepare the herb butter: In a bowl, mash ¼ cup of unsalted butter with a fork. Add the minced shallot, grated garlic, minced parsley, salt, and black pepper. Mash everything with a fork until well combined. Place in the fridge for 10-15 minutes as you prepare the steaks and fry the fries.
Prepare the steaks: Pat dry the ribeye steaks with paper towels (this is important to form a nice crust), then season generously with kosher salt and ground black pepper.
Cook the steaks: Heat olive oil and butter in a cast iron (or stainless steel) pan. When hot, add the steaks and cook for 3 minutes, then flip and cook for around 5 more minutes or until the internal temperature is 125-130°F for medium rare. Remove from the pan, cover with foil, and let rest. Optionally, spoon some of the herb butter on the steaks at this point.
Cook the fries: Heat oil in a Dutch oven to 300°F/150°C. Meanwhile, drain the potatoes and dry them with clean kitchen towels. Fry the potatoes in batches for 5 minutes, then remove from the oil with a slotted spoon and drain on a sheet fitted with a wire rack, or paper towels while you fry the other batches.
Second fry for the fries: Increase the heat of the oil to 400°F/205°C and fry each batch of fries for 5 more minutes, or until they are golden brown and crispy but not too dark. With a slotted spoon, remove the fries from the oil and drain on a wire rack or a paper towel. Season with salt while still hot.
Serve: Place the steak on a plate and add more herb butter if desired, serve with a portion of fries, a simple side salad (please link to my side salad), and possibly a sauce of choice for the fries like mayo (link to my homemade mayo recipe).